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Title: A mathematical model of solid-state dewetting of barium thin films on W (112)

Abstract

Solid state dewetting occurs when a thin solid film is heated. The temperature of dewetting depends on the thickness of the film; dewetting can be observed in the range of 1/3 to 1/2 of the bulk melting temperature. While remaining solid, the film behaves in a manner similar to liquids dewetting and agglomerating to forming islands or droplets. One of the possible mechanisms is the conversion of a metastable thin film geometry into a more stable form. Heating the metastable film gives the film atoms higher mobility, and the films retract, dewetting the surface. This atomic motion can be restricted due to surface anisotropy. Herein we present in situ emission microscopy observations of barium thin films deposited ontoW(112) by thermal evaporation. From the modeling viewpoint, the evolution of the film in this system could be divided in four stages: (i) the nucleation and growth of the thin film as a simply connected region; (ii) formation of droplets/islands/hillocks; (iii) nucleation of holes; (iv) evolution of the components of the disconnected film to their equilibrium state. We present a continuum model that is qualitatively consistent with the evolution of the film observed at the initial stage of the experiment and discuss themore » later stages of the evolution of surface structures.« less

Authors:
 [1]; ORCiD logo [1];  [1];  [1];  [2]; ORCiD logo [2];  [2]
  1. Ohio Univ., Athens, OH (United States)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States)
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); Defense Advanced Research Projects Agency (DARPA)
OSTI Identifier:
1604619
Report Number(s):
BNL-213714-2020-JAAM
Journal ID: ISSN 0973-5348
Grant/Contract Number:  
SC0012704; N66001-16-1-4040
Resource Type:
Accepted Manuscript
Journal Name:
Mathematical Modelling of Natural Phenomena
Additional Journal Information:
Journal Volume: 15; Journal ID: ISSN 0973-5348
Publisher:
EDP Sciences
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Solid-solid thin film dewetting; barium; W(112)

Citation Formats

Knavel, S. A., Savina, Tatiana V., Mroz, M. V., Kordesch, M. E., Eads, C. N., Sadowski, Jerzy T., and Tenney, S. A. A mathematical model of solid-state dewetting of barium thin films on W (112). United States: N. p., 2020. Web. https://doi.org/10.1051/mmnp/2019040.
Knavel, S. A., Savina, Tatiana V., Mroz, M. V., Kordesch, M. E., Eads, C. N., Sadowski, Jerzy T., & Tenney, S. A. A mathematical model of solid-state dewetting of barium thin films on W (112). United States. https://doi.org/10.1051/mmnp/2019040
Knavel, S. A., Savina, Tatiana V., Mroz, M. V., Kordesch, M. E., Eads, C. N., Sadowski, Jerzy T., and Tenney, S. A. Fri . "A mathematical model of solid-state dewetting of barium thin films on W (112)". United States. https://doi.org/10.1051/mmnp/2019040. https://www.osti.gov/servlets/purl/1604619.
@article{osti_1604619,
title = {A mathematical model of solid-state dewetting of barium thin films on W (112)},
author = {Knavel, S. A. and Savina, Tatiana V. and Mroz, M. V. and Kordesch, M. E. and Eads, C. N. and Sadowski, Jerzy T. and Tenney, S. A.},
abstractNote = {Solid state dewetting occurs when a thin solid film is heated. The temperature of dewetting depends on the thickness of the film; dewetting can be observed in the range of 1/3 to 1/2 of the bulk melting temperature. While remaining solid, the film behaves in a manner similar to liquids dewetting and agglomerating to forming islands or droplets. One of the possible mechanisms is the conversion of a metastable thin film geometry into a more stable form. Heating the metastable film gives the film atoms higher mobility, and the films retract, dewetting the surface. This atomic motion can be restricted due to surface anisotropy. Herein we present in situ emission microscopy observations of barium thin films deposited ontoW(112) by thermal evaporation. From the modeling viewpoint, the evolution of the film in this system could be divided in four stages: (i) the nucleation and growth of the thin film as a simply connected region; (ii) formation of droplets/islands/hillocks; (iii) nucleation of holes; (iv) evolution of the components of the disconnected film to their equilibrium state. We present a continuum model that is qualitatively consistent with the evolution of the film observed at the initial stage of the experiment and discuss the later stages of the evolution of surface structures.},
doi = {10.1051/mmnp/2019040},
journal = {Mathematical Modelling of Natural Phenomena},
number = ,
volume = 15,
place = {United States},
year = {2020},
month = {3}
}

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